Mary-Kate Olsen doesn’t seem to be paying much attention to tabloid reports about her recent weight gain. Olsen was at the Jane Hotel this week for a birthday party thrown by novel ist Danielle Steele‘s daughter, Vic toria Traina, “chain-smoking and throwing back shots,” said a source. “She looked like she was having a good time.” Last week, Star magazine wrote a story about Olsen’s healthy weight gain, saying, “Bye-bye billion-dollar looks, hello bloat.”